How to know when sentence of text end in Unity using c#

Question

I'm using Unity3D with C#. Well, I have a dialogue text script with a foreach that run the sentences list, I need to know how I can know when the first sentence finishes.

Here is my code :

public void StartDialogue(Dialogue dialogue)
{
    //Debug.Log("Start conversation with " + dialogue.name);
    cameradialogue.SetActive(true);
    FindObjectOfType<ThirdPersonCharacter> ().isStop = true;
    DialogueBox.SetActive (true);
    NameText.text = dialogue.name;
    sentences.Clear();
    foreach (string sentence in dialogue.sentences)
        sentences.Enqueue (sentence);
    DisplayNextSentence();
}

Here my method for display my setences:

    IEnumerator TypeSentence (string sentence){
        dialogueText.text = "";
        foreach (char letter in sentence.ToCharArray()) {
            dialogueText.text += letter;
            yield return null;
        }
    }

Answer 1

When the foreach loop will finish in the TypeSentence method, It will mean that the complete sentence has been displayed in the dialog text.